Motion-transmitting mechanism



Feb, 12 i924 1,483Q8g9 E. B. HouGH MOTION TRANSMITTING MEGHANISM FileiSept. 11 1920 naar B'. HOGH, or CICAGO, rLLinoIs, Assrenon To surcnrcaeo,

n I j n ivi. Parmis, TRUSTEE, or ILLrNors.

norronmnansnrrms MCHANISM.

Ap'pificaridn inea september 11', ieee. serial No. 409,560. y

Tov all fte/2,0m t may concern:

Be it known that I, EARL B. Hons-H, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois` haveinvented a certain new and useful Improvement in l\lotionfllransmitting"ll/Iechani's-m, of which the following is full, clear, concise, andeXact description, reference being had to the accompanying drawings,forming a part of this specifica tion.

My invention relates to motion-transmitting mechanism and is moreparticularly concerned' wvi'tl'r a motion tranemitting` mechanism whichI l'iave found so well adapted for usel in the: forni of a lifting ordumping gear for lifting or tiltingv the bodies of dumping vehicles and'the like that I have shown; and described the invention in con'-nectionl with a typical type of such vehicle. It is of coursevr to beunderstood' however, that I do not intend thereby to limit the inventionto such use or purpose only as I am aware and contemplatev various otheradaptations of the invention. V

It is 'the object of tl-'ris invention to provide a simple' and 'compactdevice for dumping truck bodies or the like.

To tilt a dumping body etlicie-ntly and dispose of the load therein, itisv desirable that a" variable lifting effort be provided, the maximumoccurring at initial operation and vgradually decreasing as the bodyraises to upper position.v An inversely variable tilting movement shouldpreferably accom-pany this, so that near the end of the stroke, theincreasing lightness of the load may be taken into account to allow thebody tio accelerafte inv 'motion until the operation is completed. This,I accomplish by provid'- -i'n'glga pair 'of leverl arms which form anektcnsible lifting connection betweeen r`the body andr frame andemploying a cable to actuate the arms; The cabl'e preferably is moved ina generally horiZoiitalv direction. Tlris hloriz'ontal moveinentistranslated into a vertical thrust for lifting the body first by aslreave" for initial' operation and' thereafter 't-flre Sw 1g of vthe`leVerarInSL VThe cable is slecuiedto the' pivoted to the body at a pointbelow 'the general line of` movement of the cable. This has` for itsprp'ose the obtaining of a directr initial application .of the" force"VSiubstai'nt-ial-"l'y" vet'ioallyjupoii the load thereby securing avgreat lifting addrawing vantage. Different e'ective leverages are then'provided throu'gli the' lever arms', giving to the body an acceleratedmotion until the operation is completed. The' cable moves in a generallyhorizontal direction which I term the general line' of force. i

A further feature of my invention' is the provision' of a lifting gearof Simple, prac'- ticafl', substantial and inexpensive constructionthrough which a highly effective and efficient application' of the powerto the load is had.

Other features and novel provi/sions of the invention will appear fromthev follow-v ing detailed description and the claimsftaken with aninspection of rtl'ie accompanying 's in which I shall describe aspecific embodiment of the invention in order to fully acquaint thoseskilled in the' ait with the' nature and scope thereof. In the drawings:Q

Figure l illustrates in' side elevation a dumping truck with my improvedlifting` gear applied thereto, the body of the truck being shown in thehorizontal position; and Figure 2 is a viewsimilar to Figure l showingthe body of thev truc-k tilted, in positio'n for discharging thecontents.y

In that this invention is not concerned with the details of constructionof the' vehicle in itself, I will give just sufficient description 4ofthe form Shown in the drawings as will enable those skilled in the art'yto clearlyl un'derstai'id a particular embodiment of my invention inconnection tlierewith- Referring to the drawings, the dninping body 5constituting the` load the' dumping mechanism mustl-if-t and: which maybe of any desired construction' in sov far as", the present inventionconcerned is p tally Vmoinrted at (i upoir the running gear frame 'orbed T of the vehicle. fr seat' S' of. any jsuitable on preferred' typeis mounted upon the frame T of the vehicle just forward of the'bod'y'5', the forward eiid of the body ex? tentling when in thehorizontalposition, up inniiediately adjacent therear oflthe seat asthere need" be' no provision for the upright lifting structures; foundin` the"prior` art,

therebetween Y p of the vehicle' isl tilted about 'rhetody 5 thepivotallmountinfg" 6 to'fcliec'li'argeitscontents'A by p'ver appliedthrough a-motro-n 'traiisrn-ittin niecha-irism9A ory lift'ii mecha .mn-mu. W.. be., mM-. nisn designated generallyby thefreference l.

character 9. This motion transmitting mechanism or lifting mechanism 9comprises an arm or link 10 pivoted at 11 to a suitable bracket 12, forexample, suspended from the frame of the vehicle. The link 10 ispivotally connected at its opposite end with an arm 13, which arm 13 isin turn pivotally connected at its opposite end with the body' as shownat 14. The link 10 performs the function of guiding the lower end of thelifting arm 13 whereby the initial endwise movement 0f the arm 13 issecured without imposing substantially any force thereupon, the cabletaking the load directly. rllhereafter, the guiding arm permits the arm13 to form a strut between the load and Said guide 10 in the nature of atoggle or cam to change vthe generally rhorizontal movement of the cableinto a thrust upon the lifting arm. A cable 15 connected at one end withthe arm or link 13 at a point 16 within the length of said arm leads up(Figure 1) and is trained over a sheave 17 mounted upon a substantiallyhorizontal axis carried by the frame 7 of the vehicle from where itextends back beneath a sheave 18 likewise mounted upon a, substantiallyhorizontal axis carried b y the frame 7. From beneath the sheave 18 thekcable 15 extends to and is trained about a sheave 19 mounted upon asubstantially vertical aXis carried adjacent the rear or after end ofthe frame 7 and thence forwardly beneath the opposite side of thevehicle. The forward end of the cable 15 is attached to the forward endof a piston 2() rei'iprocable in a suitable cylinder 21 carried by theframe of the vehicle. I preferably employ one of the lifting mechanismsabove set out adjacent eac-h side of the vehicle, in which eventconnection is had between'the forward ends of the two cables and asingle piston 20 through an equalizing lever arm 22 as well understoodby those skilled in the art.

Assuming that the body 5 is in the position shown in full lines inFigure 1 a dumping operation is had as follows:

The piston 20 is moved forwardly by admitting a suitable motive fluid,either air or liquid, to the cylinder 21 as well understood by thoseskilled in the art. A substantially direct force or application of poweris thereupon applied to the body 5 through the cable 15 and link 13 inthe direction indicated by the arrow A (Figure 1) tilting the body aboutthe pivotal mounting 6 into the position shown in dotted lines. Thissubstantially direct initial application of power does not secure greattilting Inovement of the body 5 relative the distance of travel of thepiston 20 but applies a relatively great force to the load to obtain apositive initial movement thereof. Upon further forward movement of thepiston 20 the power is applied through the levers 10 and 13 arranged tosecure great movement of the load relative the distance through whichthe power is thereafter applied, as evidenced by the relatively greatchange in inclination of the body 1 and relative slight change inposition of the piston 2O in Figure 2 as compared with the dotted lineposition shown in Figure 1.

It will be apparent that while a substantially direct initialapplication of the force to the load is had, this initial lifting forceis applied through a leverage, that is great lifting edect is had, byreason of the movement of the arm 10 about its pivot 11 and the gradualincrease of the angle between the links 10 and 13. '.lhereafter therelatively great increase of the angle between the links 1() and 13relative to the stroke of the piston provides for relatively greattilting of the body, with only a short application of power.

The rear board of the truck may be hinged and locked by a suitable snaplever to be automatically opened upon lifting the body of the properangle although of course such provision is immaterial in so far as thepresent invention is concerned.

While the dumping operation of the body in the particular embodimentherein disclosed is effected by means of a reciprocable piston 20 it isto be understood that the source of power set out simply represents thetype which I have fund to be satisfactory, any other source of powermay? be employed such as a suitable winch or the like.

The features of providing a direct initial application of the power toobtain a relatively great force and consequently a positive initialmovement of the load whereupon the power is applied through a leveragedesigned to secure great movement of the load relative the distancethrough which the power is thereafter applied are highly iinportantaspects of my invention.

As hereinbefore set out the invention may appear in other forms and maybe used for other purposes.

I claim 1. In combination, a load, a source of power, a pair of leverarms and a flexible element Secured to one of said lever arms forapplying power from said source to said load through said arms, firstsubstantially directly tln'ongh one of said arms and. thereafter througha leverage including said arms.

2. In combination, a load, a lifting arm for applying a substantiallydirect initial force to said load, a swinging arm providing with saidfirst arm a toggle through which. a force is thereafter applied to saidload, -a pair of sheaves, a flexible element trained between saidsheaves and connected to said lifting `arm below the adjacent sheavewhen in initial position. and means for pull.- ing on said cable. y 4

3. The combination with lthe running gear of `a vehicle of a dumpingbody pivotally mounted upon said running gear, a swinging arm carried bysaid running gear, `a lifting arm between the dumping body and saidswinging arm and a cable directly connecting said lifting arm to applyfirst, la substantially direct initial force to said 'dumping bodythrough said lifting arm, said arms 'thereafter providing a leveragethrough which the -force is applied to said body to lift said body tothe desired inclination.

4. In combination, a frame, a superposed body, a pair of toggle armslinked together, a cable connected tosaid arms, means for pulling thecable in a generally horizontal direction, and means for translating thehorizontal pull of the cable in 4a thrust substantially endwise alongthe line of lthe upper arm for initial movement of the body.

5. In combination, a frame, a superposed load a lifting arm pivo'ted tothe load, a guiding member connected to the frame and cooperating withthe lower end of the lifting arm,.a sheave secured to the frame and ahorizontally movable cable trained over the sheave and secured to thelifting arm below the sheave.

6. In combination, a frame, a load, an unfolding linkage connecting saidframe and load, a pulling cable, and guide means on said framepositioned to change the line of force of said cable, during a portionof the movement only.

7 .In combination, a frame, a load, means for moving said load withrespect tosaid frame, a pulling cable attached to said moving means toactuate the same, and stationary means for changing the line of actionof said pulling cable during ya portion of the movement only.

8. In combination, a frame, a load, means for moving said load withrespect to said frame, a pulling cable attached to said movin g means ata point having vertical displacement, and guide means intermediate theextreme positions of the point Of attachmen-t t0 engage the cable andchange its line of force.

9. In combination, a frame, a load, means for moving said load withrespect to said frame, apnlling cable attached to said moving means at apoint having vertical displacement, and guide means positioned to engagethe cable and deflect its final reach toward the vertical during thefinal portion of a downward movement.

10. In combination, a frame, a body pivoted thereto, a two-link linkageconnecting a point on said body with the frame, both links beingdownwardly inclined when in Jn'olded position, a flexible tension memberconnected to the linkage and running to a relatively remote point in agenerally horizontal direction, and guide means positioned intermediatethe elevated and lowered positions of the tension connection, to contactthe tension member and change its line of' action toward the verticalduring the lower Aportion of' the movement.

l1. In combination, a frame, a body pivoted thereto, a two-link linkageconnecting a point on said body with the frame, both links beingdownwardly inclined when in folded position, a flexible tension memberconnected to the linkage and running to a relatively remote point in agenerally horizontal direction, and guide means positioned intermediatethe elevated and lowered positions of the ltension connection, tocontact the tension member and change its line of action toward thevertical during the lower portion of the movement, the frame linkswinging into an upwardly inclined position before the verticaldisplacement of the tension connection moves the tension member awayfrom said guide means.

In witness whereof I hereunto subscribe my name this 9 day of Sept.,1920.

EARL B. HOUGH.

